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Note Allowance for loan losses (Quantitative information by loan class for loans modified as T D R) (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) loans | Dec. 31, 2017 USD ($) loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 3,193 | 2,515
Pre-Modification Recorded Investment | $ 302,946 | $ 108,342
Post Modification Recorded Investment | 264,487 | 106,604
Increase (decrease) in the allowance for loan losses as a result of modification | $ 33,398 | $ 10,176
Commercial multi-family |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 2 |
Pre-Modification Recorded Investment | $ 1,377 |
Post Modification Recorded Investment | 1,375 |
Increase (decrease) in the allowance for loan losses as a result of modification | $ 106 |
CRE non-owner occupied |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 20 | 6
Pre-Modification Recorded Investment | $ 109,081 | $ 2,172
Post Modification Recorded Investment | 79,695 | 2,032
Increase (decrease) in the allowance for loan losses as a result of modification | $ 6,230 | $ 146
CRE owner occupied |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 68 | 21
Pre-Modification Recorded Investment | $ 31,233 | $ 5,356
Post Modification Recorded Investment | 29,962 | 5,346
Increase (decrease) in the allowance for loan losses as a result of modification | $ 1,170 | $ 313
Commercial and industrial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 93 | 43
Pre-Modification Recorded Investment | $ 52,653 | $ 2,655
Post Modification Recorded Investment | 51,855 | 4,786
Increase (decrease) in the allowance for loan losses as a result of modification | $ 13,981 | $ 507
Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 1 |
Pre-Modification Recorded Investment | $ 4,210 |
Post Modification Recorded Investment | 4,293 |
Increase (decrease) in the allowance for loan losses as a result of modification | $ 474 |
Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 550 | 567
Pre-Modification Recorded Investment | $ 67,518 | $ 69,084
Post Modification Recorded Investment | 59,919 | 64,552
Increase (decrease) in the allowance for loan losses as a result of modification | $ 2,696 | $ 4,108
Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 4 | 10
Pre-Modification Recorded Investment | $ 98 | $ 347
Post Modification Recorded Investment | 96 | 347
Increase (decrease) in the allowance for loan losses as a result of modification | $ 30 | $ 101
Credit cards |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 1,015 | 1,033
Pre-Modification Recorded Investment | $ 10,065 | $ 9,283
Post Modification Recorded Investment | 10,671 | 10,196
Increase (decrease) in the allowance for loan losses as a result of modification | $ 1,331 | $ 1,241
Home equity lines of credit |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 39 | 23
Pre-Modification Recorded Investment | $ 3,961 | $ 2,504
Post Modification Recorded Investment | 3,891 | 2,421
Increase (decrease) in the allowance for loan losses as a result of modification | $ 935 | $ 299
Personal Loan |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 1,364 | 768
Pre-Modification Recorded Investment | $ 21,976 | $ 12,884
Post Modification Recorded Investment | 21,979 | 12,911
Increase (decrease) in the allowance for loan losses as a result of modification | $ 6,320 | $ 3,027
Auto Loan |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 10 | 10
Pre-Modification Recorded Investment | $ 173 | $ 2,043
Post Modification Recorded Investment | 152 | 1,999
Increase (decrease) in the allowance for loan losses as a result of modification | $ 26 | $ 362
Other |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Loan count | loans | 27 | 34
Pre-Modification Recorded Investment | $ 601 | $ 2,014
Post Modification Recorded Investment | 599 | 2,014
Increase (decrease) in the allowance for loan losses as a result of modification | $ 99 | $ 72

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